If you're not already logged in to your Appfigures account then you'll be asked to enter your Appfigures credentials. If you don't have an Appfigures account, you can quickly create one. You can accept a sharing invitation on any plan, including the basic plan.

Once you accept the invitation, the shared products will immediately show up in your account.

If you'd like to leave a share group you can do so at any time by going into Account Settings (top right corner)> Sharing.